How to start a 337

[Skymaster337B]

I say the only way to "clear" the rear prop is on the final walk-around. After that it's really an educated guess that it is clear. Starting the front engine should give enough notice to everyone to remain clear of the aircraft...and rear prop.

However, I've never heard of some one walking into the rear prop because they didn't know the aircraft was about to start-up. They typically walk into the prop getting in or out of a running aircraft.